SEMI-ANNUAL GROUNDWATER MONITORING REPORT Former Midway Petroleum Products (former Precision Valley Auto) 361 RIVER STREET SPRINGFIELD, VERMONT Vermont DEC Site #2000-2782 KAS # 408090349 December 2010 Prepared for: James Ballard 7 Juniper Hill Road Springfield, VT 05156 Phone Number: (802) 885-5090 Prepared by: 368 Avenue D, Suite #15 P.O. Box 787, Williston, Vermont 05495 (802) 383-0486 (ph), (802) 383-0490 (fax) www.kas-consulting.com
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SEMI-ANNUAL GROUNDWATER MONITORING … · SEMI-ANNUAL GROUNDWATER ... soil and utility corridors running adjacent to the site along River Street, ... in Figure 1 below. Semi-Annual
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2. SITE BACKGROUND ......................................................................................................................................1
3. GROUNDWATER FLOW DIRECTION AND GRADIENT .......................................................................1
4. GROUNDWATER SAMPLING AND ANALYSES ......................................................................................1
1) Site Location Map 2) Site Map 3) Groundwater Contour Map 4) Contaminant Concentration Map
Appendix B – Liquid Level Monitoring Data Appendix C – Groundwater Quality Summary Appendix D – Laboratory Analytical Report
Semi-Annual Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
December 2010 1 VTDEC Site #2000-2782
1.0 INTRODUCTION This report summarizes the semi-annual groundwater monitoring conducted at the Former Midway Petroleum Products property (former Precision Valley Auto) located in Springfield, Vermont on October 21, 2010 (see Site Location Map, Appendix A). Semi-annual monitoring is being conducted by KAS, Inc. (KAS) for Mr. James Ballard, the owner of the Site, in accordance with recommendations made by KAS in the April 2010 Supplemental Site Investigation (SSI) and approved by Mr. Gerold Noyes of the Vermont Department of Environmental Conservation (VTDEC) in an electronic mail message dated June 14, 2010.
2.0 SITE BACKGROUND The site was a former gasoline station located in Springfield, VT. The suspected source of on-site contamination is believed to be two former gasoline underground storage tanks (USTs) and associated piping, removed from the site in June 2000. Affected sensitive receptors include groundwater, soil and utility corridors running adjacent to the site along River Street, and Carley Brook. This is the first round of semi-annual monitoring, which was requested by Mr. Noyes of the VTDEC.
3.0 GROUNDWATER FLOW DIRECTION AND GRADIENT Water table elevation measurements were collected from all eight monitoring wells (MW09-1 through MW10-8) located on site on October 21, 2010. The depth-to-water measurements were subtracted from the top-of-casing elevation to obtain the relative water table elevation in the wells. The depth to water on this date ranged from 5.09 feet below top-of-casing (btoc) in MW09-3 to 7.28 feet btoc in MW10-7. In the eight wells measured the average depth to water was 6.27 feet btoc. No free product was observed in any of the wells during this sampling event. Liquid level monitoring data are presented in Appendix B. The water table elevations for the monitoring wells were plotted on the Site Map to generate the Groundwater Contour Map (see Appendix A). According to the data, groundwater is flowing to the southwest, towards the Black River, at an approximate hydraulic gradient of 2.1%. This groundwater flow direction and gradient is similar to previous results. 4.0 GROUNDWATER SAMPLING AND ANALYSES KAS collected groundwater samples from all eight monitoring wells (MW09-1 through MW10-8) located on site on October 21, 2010. The groundwater samples were collected according to KAS' groundwater sampling protocol, stored on ice in the field, and submitted to Endyne, Inc. of Williston, Vermont under proper chain-of-custody procedures. The groundwater samples were analyzed by EPA Method 8021B for the presence of benzene, toluene, ethylbenzene, and xylenes (BTEX), methyl tertiary butyl ether (MtBE), naphthalene, 1,3,5-trimethylbenzene (TMB), and 1,2,4-TMB. An analytical summary for each monitoring well is presented along with the applicable Vermont Groundwater Enforcement Standards (VGES) in Figure 1 below.
Semi-Annual Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
TOTAL VOCs 1,424.4 143.6 357.5 1.1 - According to the figure above, the highest contamination at the site appears to be in the vicinity of MW09-1 and MW10-5, which is located east of the former pump island (see Contaminant Distribution Map in Appendix A.). Contaminant concentrations detected in monitoring wells MW10-6 and MW10-7 report only Benzene as the compound above the VGES for this sampling event. No levels above the VGES were reported in the groundwater samples collected from MW09-2 and MW10-8 for this sampling event. Groundwater samples collected from MW09-3 and MW09-4 have reported non-detect levels of Volatile Organic Compounds (VOCs) since sampling began in these wells since October 2009. Analytical results of the groundwater samples from the monitoring wells are tabulated and graphed in Appendix C along with the applicable VGES for the target petroleum compounds. The laboratory analysis report for the October 21, 2010 sampling data is included in Appendix D.
Semi-Annual Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
December 2010 VTDEC Site #2000-2782
3
The contaminant concentrations reported for October 21, 2010 sampling event were plotted on the Site Map to generate the Contaminant Distribution Map presented in Appendix A. Based on these results, the extent of the contaminant plume is likely contained on the subject property. The potential still remains that the Carley Brook and utility corridor running adjacent to the site along River Street are at risk of petroleum contamination but it is unlikely at this time. One trip blank and one duplicate sample (MW10-5) were collected for quality assurance/quality control (QA/QC). The results of the duplicate sample analysis were analyzed using a relative percent difference (RPD) method. The RPD is defined as 100 times the difference between the sample result and the duplicate result, divided by the mean of the sample and duplicate result. The RPD calculations are presented in the Groundwater Quality Summary in Appendix C. The RPD ranged from 3.0% for Benzene to -1.8% for 1,3,5-TMB, with an overall RPD of -0.1%, indicating good precision. Because VOC contaminants were not detected in the trip blank, the effect of spurious influences on sample quality is considered insignificant. Screening of the soil stockpiled on site produced during the April 2010 drilling activities was screened during this site visit. PID readings were reported from 0.3 part per million (ppm) to 21.9 ppm. PID readings were above 1 ppm therefore the soils were covered and left on site. 5.0 CONCLUSION Based on the results of this groundwater monitoring at the Former Midway Petroleum Products property (former Precision Valley Auto) located in Springfield, Vermont, KAS presents the following conclusions: 1) The groundwater elevations measured on October 21, 2010 suggests groundwater is flowing
to the southwest, towards the Black River, at an approximate hydraulic gradient of 2.1%. This groundwater flow direction and gradient is similar to previous results;
2) The highest contamination at the site appears to be in the vicinity of MW09-1 and MW10-5,
which is located east of the former pump island. Contaminant concentrations detected in monitoring wells MW10-6 and MW10-7 report only Benzene as the compound above the VGES for this sampling event;
3) No levels above the VGES were reported in the groundwater samples collected from MW09-
2 and MW10-8 for this sampling event. Groundwater samples collected from MW09-3 and MW09-4 have reported non-detect levels of VOCs since sampling began in these well since October 2009;
4) The results of this groundwater monitoring sampling event suggest the extent of the
contaminant plume is likely contained on the subject property. However, the potential still remains that the Carley Brook and utility corridor running adjacent to the site along River Street are at risk of petroleum contamination but it is unlikely at this time; and
Semi-Annual Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
December 2010 VTDEC Site #2000-2782
4
5) Screening of the soil stockpiled on site produced during the April 2010 drilling activities was
screened during this site visit. PID readings were reported from 0.3 part per million (ppm) to 21.9 ppm. PID readings were above 1 ppm therefore the soils were covered and left on site.
6.0 RECOMMENDATIONS Groundwater sampling should continue on a semi-annual basis with the next sampling event to occur in April 2011. Groundwater samples should be collected from monitoring wells MW09-1, MW09-2, and MW10-5 through MW10-8. Monitoring well MW09-3 and MW09-4 should be taken off the sampling schedule due to VOC concentrations reported below the VGES since sampling began in October 2009. Groundwater samples collected should be submitted for laboratory analysis via EPA Method 8021B. No further investigation is recommended at this time. During the April 2011 sampling event, screening of the soil stockpile produced during the April 2010 drilling activates should be screened using a PID. If PID readings are below 1 part per million (ppm) the soil should be thin-spread across the site.
Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
Notes: All Values Reported in Feet except specific gravitybtoc - Below Top of Casingbgs - Below Ground SurfaceTop of casing elevations surveyed by KAS on April 6, 2010Elevations determined relative to MW09-1, which was arbitarily set at 100'.NM = Not Measured
Notes: All Values Reported in Feet except specific gravitybtoc - Below Top of Casingbgs - Below Ground SurfaceTop of casing elevations surveyed by KAS on April 6, 2010Elevations determined relative to MW09-1, which was arbitarily set at 100'.NM = Not Measured
HISTORIC GROUNDWATER ELEVATION
Black River Jiffy Mart Monitoring Wells
SMS #2000-2782KAS #408090349
Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
December 2010 VTDEC Site #2000-2782
Groundwater Quality Summary Data
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) except for TPH which is reported in mg/L (ppm)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy, 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW09-1
0.
1,000.
2,000.
3,000.
4,000.
5,000.
6,000.
7,000.
8,000.
Jan-09 Jan-10 Jan-11
Date
Tota
l Tar
gete
d VO
Cs
90.
91.
92.
93.
94.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
SMS #2000-2782KAS #408090349
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) except for TPH which is reported in mg/L (ppm)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy, 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) except for TPH which is reported in mg/L (ppm)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy, 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW09-3
0.
50.
100.
150.
200.
Jan-09 Jan-10 Jan-11
Date
Tota
l Tar
gete
d VO
Cs
90.
91.
92.
93.
94.
95.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
SMS #2000-2782KAS #408090349
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) except for TPH which is reported in mg/L (ppm)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
Well Not Located
MW09-4
0.
50.
100.
150.
200.
Jan-09 Jan-10 Jan-11
Date
Tota
l Tar
gete
d VO
Cs
92.
93.
94.
95.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
SMS #2000-2782KAS #408090349
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW10-5
0.
250.
500.
750.
1,000.
1,250.
1,500.
Jan-10 Jan-11Date
Tota
l Tar
gete
d VO
Cs
93.
94.
95.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW10-6
0.
50.
100.
150.
200.
250.
Jan-10 Jan-11Date
Tota
l Tar
gete
d VO
Cs
93.
94.
95.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb) ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW10-7
0.
50.
100.
150.
200.
250.
300.
350.
400.
450.
500.
Jan-10 Jan-11Date
Tota
l Tar
gete
d VO
Cs
92.
93.
94.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProductsSpringfield, VT
Only Method 8021B compounds and reported compounds are included in the tableAll Values Reported in ug/L (ppb)ND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , 2/14/05 and revised (TMB, Dioxane, and Manganese) on 2/26/07.
> VGES values greater than current standards are shaded
MW10-8
0.
25.
50.
75.
100.
125.
150.
Jan-10 Jan-11Date
Tota
l Tar
gete
d VO
Cs
92.
93.
94.
Wat
er E
leva
tion
(ft)
TOTAL TARGETED VOCs Water Elevation
GROUNDWATER QUALITY SUMMARY Former Midway Petroleum ProdcutsSpringfield, VT
All Values Reported in ug/L (ppb), except RPD which is reported as a percentageNM - Not MeasuredND(1) - None Detected above Detection Limit (Detection Limit)TBQ(1) - Trace Below Quantitation Limit (Quantitation Limit)Detections are bolded.Blank cell - not analyzedVGES - Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/05
>VGES
QUALITY ASSURANCE / QUALITY CONTROL (QA/QC) SAMPLES
* RPD = The results of the laboratory analysis of the duplicate sample were analyzed using a relative percent difference (RPD) analysis. The RPD is defined as 100 times the difference in reported concentration between sample and duplicate, divided by the mean of the two samples. A small RPD indicates good correlation between sample and duplicate.
350
SMS #2000-2782KAS #408090349
Groundwater Monitoring Report Former Midway Petroleum Products, Springfield, Vermont
December 2010 VTDEC Site #2000-2782
Groundwater Analytical Reports
Laboratory Report
408090349 Precision Valley A.PROJECT:
DATE RECEIVED:WORK ORDER:
DATE REPORTED:
100306KAS, Inc.PO Box 787Williston, VT 05495
SAMPLER:October 29, 2010
1010-14770
Alan
October 22, 2010
Enclosed please find the results of the analyses performed for the samples referenced on the attached chain of custody located at the end of this report.
The column labeled Lab/Tech in the accompanying report denotes the laboratory facility where the testing was performed and the technician who conducted the assay. A "W" designates the Williston, VT lab under NELAC certification ELAP 11263; "R" designates the Lebanon, NH facility under certification NH 2037 and “N” the Plattsburgh, NY lab under certification ELAP 11892. “Sub” indicates the testing was performed by a subcontracted laboratory. The accreditation status of the subcontracted lab is referenced in the corresponding NELAC and Qual fields.
This NELAC column also denotes the accreditation status of each laboratory for each
reported parameter. “A” indicates the referenced laboratory is NELAC accredited for the parameter reported. “N” indicates the laboratory is not accredited. “U” indicates that NELAC does not offer accreditation for that parameter in that specific matrix. Test results denoted with an “A” meet all National Environmental Laboratory Accreditation Program requirements except where denoted by pertinent data qualifiers. Test results are representative of the samples as they were received at the laboratory.
Endyne, Inc. warrants, to the best of its knowledge and belief, the accuracy of the analytical
test results contained in this report, but makes no other warranty, expressed or implied, especially no warranties of merchantability or fitness for a particular purpose.
Reviewed by:
Harry B. Locker, Ph.D.Laboratory Director
160 James Brown Dr., Williston, VT 05495Ph 802-879-4333 Fax 802-879-7103